Finding the Fourth Proportional to 397,901.58, 549,111.18 and 216,618.72

Step by Step Solution

1. Step 1: Write the proportion equation
   397,901.58 : 549,111.18 = 216,618.72 : x
2. Step 2: Convert to fraction form
   397,901.58/549,111.18 = 216,618.72/x
3. Step 3: Cross multiply
   397,901.58x = 549,111.18 × 216,618.72
4. Step 4: Simplify right side
   397,901.58x = 118,947,760,949.29
5. Step 5: Solve for x
   x = 118,947,760,949.29/397,901.58
6. Step 6: Final answer
   x = 298,937.64